Summary

Returns the full details of a single order by its id — the same OrderDetails
model returned by make amendments and the
active orders response, including items
(each with id), archived_items (with amends / original / refactors /
archived_reason), and the post-amendment totals.

Usage scenario

Re-fetch a single order to reconcile its (repriced) state — for example after a
lost POST /amendments response — without paging the active-orders list.

Operational constraints

Subject to the standard per-order rate limit; exceeding it returns a "Too many requests" error.